热解
材料科学
钠
化学工程
微观结构
阴极
钾
碳纤维
电化学
超级电容器
复合材料
化学
电极
冶金
物理化学
工程类
复合数
作者
Xiuping Yin,Yufeng Zhao,Xuan Wang,Xiaochen Feng,Zhixiu Lu,Yong Li,Hongli Long,Jing Wang,Jinyan Ning,Jiujun Zhang
出处
期刊:Small
[Wiley]
日期:2021-12-01
卷期号:18 (5)
被引量:57
标识
DOI:10.1002/smll.202105568
摘要
Resin derived hard carbons (HCs) generally demonstrate remarkable electrochemical performance for both sodium ion batteries (SIBs) and potassium-ion batteries (KIBs), but their practical applications are hindered by their high price and high temperature pyrolysis (≈1500 °C). Herein, low-cost pitch is coated on the resin surface to compromise the cost, and meanwhile manipulate the microstructure at a relatively low pyrolysis temperature (1000 °C). HC-0.2P-1000 has a large number of short graphitic layer structures and a relatively large interlayer spacing of 0.3743 nm, as well as ≈1 nm sized nanopores suitable for sodium storage. Consequently, the as produced material demonstrates a superior reversible capacity (349.9 mAh g-1 for SIBs and 321.9 mAh g-1 for KIBs) and excellent rate performance (145.1 mAh g-1 at 20 A g-1 for SIBs, 48.5 mAh g-1 at 20 A g-1 for KIBs). Furthermore, when coupled with Na3 V2 (PO4 )3 as cathode, the full cell exhibits a high energy density of 251.1 Wh kg-1 and excellent stability with a capacity retention of 73.3% after 450 cycles at 1 A g-1 .
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